Terahertz sensing with optimized Q/V eff metasurface cavities

Confinement of electromagnetic radiation in a subwavelength cavity is an important platform for strong light–matter interaction as it enables efficient design of photonic switches, modulators, and ultrasensitive sensors. Metallic metasurfaces consist of an array of planar cavities that allow easy ac...

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Main Authors: Gupta, Manoj, Singh, Ranjan
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2021
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Online Access:https://hdl.handle.net/10356/146261
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1462612023-02-28T19:48:24Z Terahertz sensing with optimized Q/V eff metasurface cavities Gupta, Manoj Singh, Ranjan School of Physical and Mathematical Sciences Science Photon Lifetime Sensing Confinement of electromagnetic radiation in a subwavelength cavity is an important platform for strong light–matter interaction as it enables efficient design of photonic switches, modulators, and ultrasensitive sensors. Metallic metasurfaces consist of an array of planar cavities that allow easy access to confined electromagnetic modes on the surface. However, the radiative and nonradiative losses limit the quality factor (Q) of the resonantly confined mode. Therefore, metasurface designs with effectively low mode volume (Veff) cavities become extremely important for enhancing the photonic density of states. Here, a symmetric Lorentzian resonant metasurface with lower Veff is demonstrated as compared to asymmetric Fano resonators. Lower mode volume and optimized Q/Veff metasurfaces reveal enhanced sensitivity for ultrathin analyte overlayers deposited on metasurfaces signaling enhanced light–matter interaction. Such metasurfaces with tightly confined electromagnetic modes could find wide range of applications in the development of terahertz metadevices including ultrasensitive sensors, bandpass filters, and energy-efficient modulators. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) Accepted version The authors acknowledge the financial support from the Singapore Ministry of Education (MOE) Academic Research Fund (AcRF) Tier 1 grant RG96/19, Tier 2 grant MOE2017‐T2‐1‐110, Tier 3 grant MOE2016‐T3‐1‐006, and Advanced Manufacturing and Engineering (AME) Programmatic grant (A18A5b0056) by Agency for Science, Technology and Research (A*STAR) 2021-02-04T06:51:24Z 2021-02-04T06:51:24Z 2020 Journal Article Gupta, M., & Singh, R. (2020). Terahertz sensing with optimized Q/V eff metasurface cavities. Advanced Optical Materials, 8(16), 1902025-. doi:10.1002/adom.201902025 2195-1071 https://hdl.handle.net/10356/146261 10.1002/adom.201902025 2-s2.0-85085507307 16 8 1902025 en 2019-T1-001-040 Advanced Optical Materials 10.21979/N9/SRDC9A This is the accepted version of the following article: Gupta, M., & Singh, R. (2020). Terahertz sensing with optimized Q/V eff metasurface cavities. Advanced Optical Materials, 8(16), 1902025-. doi:10.1002/adom.201902025, which has been published in final form at https://doi.org/10.1002/adom.201902025. This article may be used for non-commercial purposes in accordance with the Wiley Self-Archiving Policy [https://authorservices.wiley.com/authorresources/Journal-Authors/licensing/self-archiving.html]. application/pdf application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science
Photon Lifetime
Sensing
spellingShingle Science
Photon Lifetime
Sensing
Gupta, Manoj
Singh, Ranjan
Terahertz sensing with optimized Q/V eff metasurface cavities
description Confinement of electromagnetic radiation in a subwavelength cavity is an important platform for strong light–matter interaction as it enables efficient design of photonic switches, modulators, and ultrasensitive sensors. Metallic metasurfaces consist of an array of planar cavities that allow easy access to confined electromagnetic modes on the surface. However, the radiative and nonradiative losses limit the quality factor (Q) of the resonantly confined mode. Therefore, metasurface designs with effectively low mode volume (Veff) cavities become extremely important for enhancing the photonic density of states. Here, a symmetric Lorentzian resonant metasurface with lower Veff is demonstrated as compared to asymmetric Fano resonators. Lower mode volume and optimized Q/Veff metasurfaces reveal enhanced sensitivity for ultrathin analyte overlayers deposited on metasurfaces signaling enhanced light–matter interaction. Such metasurfaces with tightly confined electromagnetic modes could find wide range of applications in the development of terahertz metadevices including ultrasensitive sensors, bandpass filters, and energy-efficient modulators.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Gupta, Manoj
Singh, Ranjan
format Article
author Gupta, Manoj
Singh, Ranjan
author_sort Gupta, Manoj
title Terahertz sensing with optimized Q/V eff metasurface cavities
title_short Terahertz sensing with optimized Q/V eff metasurface cavities
title_full Terahertz sensing with optimized Q/V eff metasurface cavities
title_fullStr Terahertz sensing with optimized Q/V eff metasurface cavities
title_full_unstemmed Terahertz sensing with optimized Q/V eff metasurface cavities
title_sort terahertz sensing with optimized q/v eff metasurface cavities
publishDate 2021
url https://hdl.handle.net/10356/146261
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